diff --git a/reactos/hal/hal/hal.c b/reactos/hal/hal/hal.c
index 8e58f47b3d6..033d01d9cf7 100644
--- a/reactos/hal/hal/hal.c
+++ b/reactos/hal/hal/hal.c
@@ -159,8 +159,8 @@ HalAssignSlotResources(
 
 BOOLEAN 
 NTAPI 
-HalBeginSystemInterrupt (ULONG Vector,
-			 KIRQL Irql,
+HalBeginSystemInterrupt (KIRQL Irql,
+			 ULONG Vector,
 			 PKIRQL OldIrql)
 {
   UNIMPLEMENTED;
diff --git a/reactos/hal/halx86/generic/irql.c b/reactos/hal/halx86/generic/irql.c
index 5ad9d079b3b..e2ce37856ae 100644
--- a/reactos/hal/halx86/generic/irql.c
+++ b/reactos/hal/halx86/generic/irql.c
@@ -355,8 +355,8 @@ KeRaiseIrqlToSynchLevel (VOID)
 
 
 BOOLEAN STDCALL 
-HalBeginSystemInterrupt (ULONG Vector,
-			 KIRQL Irql,
+HalBeginSystemInterrupt (KIRQL Irql,
+			 ULONG Vector,
 			 PKIRQL OldIrql)
 {
   ULONG irq;
diff --git a/reactos/hal/halx86/mp/apic.c b/reactos/hal/halx86/mp/apic.c
index 8323cf3af39..04770bac936 100644
--- a/reactos/hal/halx86/mp/apic.c
+++ b/reactos/hal/halx86/mp/apic.c
@@ -751,8 +751,8 @@ VOID MpsIpiHandler(VOID)
 {
    KIRQL oldIrql;
 
-   HalBeginSystemInterrupt(IPI_VECTOR, 
-                           IPI_LEVEL, 
+   HalBeginSystemInterrupt(IPI_LEVEL,
+                           IPI_VECTOR, 
 			   &oldIrql);
    Ki386EnableInterrupts();
 #if 0
diff --git a/reactos/hal/halx86/mp/mpsirql.c b/reactos/hal/halx86/mp/mpsirql.c
index 47475c94c1e..347880f4183 100644
--- a/reactos/hal/halx86/mp/mpsirql.c
+++ b/reactos/hal/halx86/mp/mpsirql.c
@@ -291,8 +291,8 @@ KeRaiseIrqlToSynchLevel (VOID)
 
 
 BOOLEAN STDCALL
-HalBeginSystemInterrupt (ULONG Vector,
-			 KIRQL Irql,
+HalBeginSystemInterrupt (KIRQL Irql,
+			 ULONG Vector,
 			 PKIRQL OldIrql)
 {
   ULONG Flags;
diff --git a/reactos/include/ndk/halfuncs.h b/reactos/include/ndk/halfuncs.h
index c8e29b93375..3f4a88be0c0 100644
--- a/reactos/include/ndk/halfuncs.h
+++ b/reactos/include/ndk/halfuncs.h
@@ -95,8 +95,8 @@ NTHALAPI
 BOOLEAN
 NTAPI
 HalBeginSystemInterrupt(
-    ULONG Vector,
     KIRQL Irql,
+    ULONG Vector,
     PKIRQL OldIrql
 );
 
diff --git a/reactos/ntoskrnl/ke/i386/irq.c b/reactos/ntoskrnl/ke/i386/irq.c
index 0a567f8a8ff..aadf0fcdd43 100644
--- a/reactos/ntoskrnl/ke/i386/irq.c
+++ b/reactos/ntoskrnl/ke/i386/irq.c
@@ -275,8 +275,8 @@ KiInterruptDispatch (ULONG vector, PKIRQ_TRAPFRAME Trapframe)
     * Notify the rest of the kernel of the raised irq level. For the
     * default HAL this will send an EOI to the PIC and alter the IRQL.
     */
-   if (!HalBeginSystemInterrupt (vector,
-                                 VECTOR2IRQL(vector),
+   if (!HalBeginSystemInterrupt (VECTOR2IRQL(vector),
+                                 vector,
                                  &old_level))
      {
        return;